Electrode for unipolar high-frequency therapeutic treatment



Nov. 3, 1925. 1,559,769

W. OTTO ELECTRODE FOR UNIPOLAR HIGH FREQUENCY THERAPEUTIC TREATMENT Filed May 17, 1923 Patented ,Nov. 3, 1925.

} UNITED STATESPA'TENT OFFICE.

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Application filed m 11, 192:. Serial No. 039,044.

To all whom it may concern:

Be it known that I, WERNER OTTO, a citizen of Germany, residing at Berlin, Germany, have invented certain new and useful Improvements in Electrodes for Unipolar High-Frequency Therapeutic Treatment, of which the following is a specification My invention relates to improvements in electrodes for unipolar high frequency therapeu tic treatment, and more particularly in electrodes comprising a vacuum tube having a dischar e electrode wire passed through the wal thereof and adapted to be connected to the free pole of ,a Tesla coil.

7 The object of the improvements is to provide an electrode of this type in which the destruction of the joint between the electrode wire and the wall of the tube by the glowing of the said wire is avoided. With this object in view my invention consists in providing an elongated electrode wire and bending the same into a body of reduced length, so that the heat developed by the discharge has to the point where the wire is the joint is not subject to high heat even if the free end of the wire is caused to glow.

For the purpose of explaining the inven tion two examples embodying the same have been shown in the accompanying drawing, in which,

Fig. 1 is a diagrammatical sectional View shgwlng an apparatus in which the elongated electrode wire is in the form of a coil,

' and vFig. 2 is a similar view showing a part of an apparatus in which thewire is bent into a serpentine line.

In the example shownin Fig. 1 the apparatus consists of a vacuum tube a of glass aving an elongated ortion d of reduced cross-section, a wire e ectrode b fused into the wall of the tube at the end of the reduced portion d thereof, and a cap 0 of metal seof reduced len cured to the reduced\portion and having the mm I) passed therethrough. -The wire is fused into the wall of the vacuum tube, for which reason it is made from a material having substantially the same coeflicient of expansion by heat as glass, for example from nickel-iron. In the example shown in Fig. 1 the wire 6 is formed into a coil, so that the transmission of heat from the end of the wire tothe joint in the wall of the tube is long and the said joint is kept cool.

In the modification shown in Fig. 2 the same result is attained by bending the wire 6 along a serpentine line, the adjacent loops being in close relation to one another.

I wish it to be understood that my invention is not limited to'the specific forms of the wire shown in the figures.

' I claim:

1. An electro therapeutic high frequency electrode, comprising a vacuum tube, and a relatively long wire passed into the same and bent into a body of reduced length, forming vthe discharge electrode-of said vacuum tube and extendmg over a small the length of the tube.

2. An electro therapeutic high frequency electrode, comprising a vacuum tube, and a relatively long wire assed into the same and coiled into a bo y of reduced length, forming the discharge electrode of said vacuum tube and extending over a small portion only of the length of the tube.

3. An'electro therapeutic high frequency electrode, comprising a vacuum tube having a discharge electrode formed by a body of relatively grealt length bent intoa body portion only of 4. An electro e according to claim 3, having a discharge electrode in the form of a 0011.

In testimony whereof I afiix my signature.

WERNER OTTO. 

